Common skin rashes include shingles, eczema, rosacea, psoriasis and heat rash, says Mayo Clinic. Allergens, infections, immune system disorders, heat and medications are all factors that cause skin rashes.
Shingles is caused by the chickenpox virus, and starts with pain and itching with no clear external cause, explains Mayo Clinic. Clusters of blisters appear in a limited, area and then break and leave behind ulcers that dry out. Eczema is a chronic condition that leads to inflamed, itchy skin that appears in patches. Small, red bumps on the face that look like acne could be rosacea, a chronic, inflammatory condition that flares up periodically. Psoriasis is the result of a thick, scaly accumulation of dead skin that ranges from being a mild nuisance to a severe disability. When the body's flow of sweat is obstructed, heat rash appears in the form of small, red bumps or clear, fluid-filled bumps.
Most skin rashes are not a cause for alarm and many fade away on their own, says MedicineNet.com. Hydrocortisone cream and oral antihistamines are an effective treatment for itching. Moisturizing lotions alleviate some discomfort. Topical antifungal medications, such as Mycatin, Lotrimin and Lamisil, are used to treat fungal infections. When a rash persists or becomes more severe, a doctor or dermatologist should be consulted.